Edward weston



(No Model.)

E. WESTON.

BLEGTRO MAGNET.

No. 255,365. Patented Mar.21,1882.

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UNITED STATES PATENT OFFICE.

EDWARD WESTON, OF NE\VARK, NEW JERSEY, ASSIGNOR TO THE UNITED STATES ELECTRIC LIGHTING COMPANY, OF NEW YORK, N. Y.

ELECTRO-MAGNET.

SPECIFICATION forming part of Letters Patent No. 255,865, dated March 21, 1882.

Application filed August 10, 1881. (No model.)

To all whom it may concern:

Be it known that I, EDWARD WESTON, of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Electro-Magnets, of

which the following is a specification.

My invention consists in an improved form of electro-magnet and armature designed especially for use with electric-light regulators,

or in other similar devices, the object of the invention being to obtain as great range of motion as possible in the armature without sensible variations in the magnetic attraction, and also to produce a magnet which, while oecupying avery small space, shall possess great attractive power.

In the accompanying drawings, Figure 1 is a central vertical section of a magnet constructed according to my invention; Fig. 2

the same as applied to a special form of electric lamp.

A is the usual form of helix, composed of a hollow spool of metal or other material, between the flanges of which a number of convolutions of coarse copper wire D are wound. Suspended within the hollow spool is an iron core, 0, attached to or forming part of an iron shell,B, which completely incloses the top and sides of the helix A. The action of a magnet thus constructed will befound to be much more powerful than that of the ordinary types, as both the core and the shell are affected by the current circulating in the coil D. Its application to an electric lamp, obvious in most cases to one skilled in the art, is illustrated in Fig. 2, where K represents the base of the case or box containing the regulating mechanism; B, the electro-magnet,constructed as above described; F, a pivoted frame carrying a train of gears meshing at one end by a pinion, G, with a carbon rack-bar, H, and ending in a fan or flutter-wheel,L. In this case, as the magnet Bis energized and the shell and core drawn down, one of the train of wheels, generally the flutter- 5 wheel, is brought into engagementwith a detent. By this means the rack-bar H, to which the carbon is attached, is raised and the are formed.

It is sometimes desirable to wind the helix with two separate coils, one of coarse wire for the main or are circuit, the other of fine wire (indicated in Fig. 1 by E) for the shunt about the lamp. The purpose of this, as is now well understood, is to effect a more delicate and accurate feed of the carbons than by the usual method of employing a spring, S, Fig. 2, to counteract the attraction of the main magnet.

In this case the effect of the fine wire coil would be to counteract that of the inner coil, and produce a very delicate and sensitive magnet.

The chief advantageof this form of magnet lies in the fact that its armature is capable of a wide range of motion, and this without sensible decrease in attractive power.

I am aware that magnets consisting of a hollow helix with a central movable core are common; also, that said cores have been combined with caps of magnetic metal; and, further, that a helix partially tilled by a core of iron or other material has been employed in conjunction with a core and shell, the lat ter extending partially down over the helix.

I have found, however, that the presence of a stationary core in the helix or the absence of part of the inclosing-shell defeats the object desired-to wit, a considerable range of motion attended by great and not sensibly varying attractive power.

Other important features of this form of So magnet are its small size and great power, and the slight expense which its construction involves.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, with a hollow helix of insulated wire, of a movable armature composed of a central core extending entirely through the helix, and an inclosing-shell, of 0 iron, of equal length therewith, substantially as set forth.

2. The combination,in an electric lamp, with the swinging lever or frame supporting the feed regulating mechanism, of a hollow stationary helix composed of one or more coils of insulated wire, as described, and a movable armature consistingot' a central core capable of extending entirely through the helix, and an inclosing-shell, of iron, of equal length I00 therewith, substantially as shown and described.

In testimony whereot' I have hereunto set my hand this 6th day of August, 1881.

. EDWARD WESTON.

Witnesses:

PARKER W. PAGE, CLAYTON KNEELAND. 

